chore(release.yaml): update workflow to set Flutter app version from Git tag

- Adds script to parse Git tag, calculate semantic version and numeric build code
- Updates `pubspec.yaml` with version and build code during release

.gitea/workflows/release.yaml

@@ -86,6 +86,30 @@ jobs:
       - name: Install dependencies
         run: flutter pub get
 
+      - name: Set version from git tag
+        run: |
+          set -e                                                                                                                                            
+          RAW_TAG="${GITHUB_REF_NAME:-${GITHUB_REF##*/}}"                                                                                                   
+          
+          # Strip leading 'v' if present (v1.2.3 -> 1.2.3)                                                                                                  
+          VERSION="${RAW_TAG#v}"                                                                                                                            
+          
+          # Extract a numeric build number for versionCode.                                                                                                 
+          # Converts semver x.y.z into a single integer: x*10000 + y*100 + z                                                                                
+          # e.g. 1.1.1 -> 10101, 2.3.15 -> 20315                                                                                                            
+          MAJOR=$(echo "$VERSION" | cut -d. -f1)                                                                                                            
+          MINOR=$(echo "$VERSION" | cut -d. -f2)                                                                                                            
+          PATCH=$(echo "$VERSION" | cut -d. -f3)                                                                                                            
+          MAJOR=${MAJOR:-0}; MINOR=${MINOR:-0}; PATCH=${PATCH:-0}                                                                                           
+          VERSION_CODE=$(( MAJOR * 10000 + MINOR * 100 + PATCH ))                                                                                           
+          
+          echo "Version: $VERSION, VersionCode: $VERSION_CODE"                                                                                              
+          
+          # Update pubspec.yaml: replace the version line                                                                                                   
+          sed -i "s/^version: .*/version: ${VERSION}+${VERSION_CODE}/" pubspec.yaml
+          
+          grep '^version:' pubspec.yaml 
+
       # ADD THIS NEW STEP
       - name: Setup Android Keystore
         env: